Buried cable current carrying capacity calculation method

A technology of flow calculation and calculation method, which is applied in the direction of calculation, electrical digital data processing, design optimization/simulation, etc. It can solve the problems of increased workload and cumbersome calculation process, and achieve the effect of reducing workload.

Inactive Publication Date: 2017-01-04
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

However, in its application process, the calculation process is cumbersome. When external conditions change, ...

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  • Buried cable current carrying capacity calculation method
  • Buried cable current carrying capacity calculation method
  • Buried cable current carrying capacity calculation method

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Embodiment Construction

[0036] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, a method for calculating the ampacity of directly buried cables includes the following steps:

[0038] S1. Establish a two-dimensional temperature field model of the direct-buried cable, and establish a geometric model of the direct-buried cable according to the cable laying and environmental parameters in the two-dimensional temperature field model.

[0039] Considering that the power cable line generally reaches hundreds of meters to several thousand meters, and its outer diameter is often about 100mm, compared with the power cable cross section and the outer diffusion cross section, the length of the power cable line is approximately infinite, so the soil is buried directly The cable temperature field is simplified to a two-dimensional temperature field model for analysis and...

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Abstract

The invention discloses a buried cable current carrying capacity calculation method. The method comprises the following steps that S1, a two-dimensional temperature field model of a buried cable is established, and a geometrical model of the buried cable is established according to cable arrangement in the two-dimensional temperature field model and environmental parameters; S2, physical property parameters of soil around the buried cable are determined; S3, the scope and boundary conditions of the two-dimensional temperature field model of the buried cable are determined; S4, the buried cable is subjected to grid division, and the minimum grid unit size and the maximum grid unit size which are matched with the geometrical model of the buried cable are set; S5, the calculation method of two-dimensional temperature field distribution of the buried cable is determined, and a corresponding solver is configured; S6, calculation is conducted to obtain two-dimensional temperature field distribution of the buried cable, and consequently the steady-state current carrying capacity of the buried cable is obtained. Based on a finite element method, the current carrying capacity value of the cable is obtained by establishing a current carrying capacity calculation model of the buried cable and simulating actual heat exchange boundary conditions.

Description

technical field [0001] The invention relates to the technical field of ampacity calculation of power cables, in particular to a method for calculating the ampacity of direct-buried cables. Background technique [0002] With the rapid development of insulating materials and the continuous acceleration of urbanization, urban power transmission and distribution lines have gradually shifted from overhead laying to underground cable laying. Compared with overhead laying, underground power cables can save air corridors and reduce the impact of power transmission and distribution lines on urban appearance, but it also brings problems such as difficult maintenance and deterioration of heat dissipation conditions. [0003] Due to the complex laying environment of underground power cables, how to accurately determine the load of power cables and maximize the utilization of power cables has always been a major concern of the power sector. At present, IEC-60287 is the main basis for ca...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2113/16
Inventor 姚周飞李红雷贺林傅晨钊
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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